Hi Aquarias. When I first went to the Doctors with my symptoms I was really worried that I had some kind of cancer, especially as my Gran died of stomach cancer and my Mum's had curable cancer in her jaw, my Auntie in her breast. The Doctor said I wasn't being as irrational as I thought but I also got and sometime to get that feeling of something being really wrong inside although the Doctor's said it's almost definitely not something like that. I have had an Endoscopy, a telescope in my stomach and they've said there's nothing wrong but still, like you, I am reluctant to trust medical testing especially because I hear stories of people who have had their illnesses missed. The NHS is in such a state here though that I don't have a lot of faith in it.